2 Answers

MY CANON MP480 HAS A MAJOR PROBLEM!
For it to be long term fixed send it to the manufacturers or someone able to fix it.
Very short term:
Simply uninstall the printer from your computer, reinstall it then turn it on. If that doesnt work just shake i hard and click OK.
The short term problem solver worked for me.
=] Bye, Hope i helped xoxo

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Sounds like there is something in the paper track that's causing this to jam. Its not always easy to get small particles cleared just by removing the jammed paper.

This may not help everyone that I send it to, but it is worth a try.I suggest you get a sheet of Card Stock (Heavy paper) and place it in the feed way. Then pressthe print button applying a slight amount of pressure on the Card Stock so it will feed through the printer.The reason for this is in some cases I have been able to clear the paper track of debris that was deposited there over time.Worth a try, as I have fixed a number of printers this way, saving costly repairs.Hope this helps. Bud

All printers after sometime the rollers start grapping more than one sheet that result in paper jam or dirt building up inside…make sure you open the printer and clean it good and see if you can locate any small papers that usually stuck inside…let me know
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GGONG644, Try this fix. TURN OFF PRINTER wait ( 10 or 15 seconds) turn it back ON and listen for
paper ROLLERS to be turning and FORCE FEED A single sheet of paper through print rollers until it PULLS it through the printer and SEE if a scrap of paper comes out with sheet ? Let me know if this works ? Phil at palcando@yahoo.com

Had this problem, too with HP PSC 1610 AIO, paper would pull in part way and stop, then display would indicate: Paper Jam, Clear Jam and Press OK, but there was no paper in the path at all. Found in HP forums that possibly the problem was a broken off piece that may be called the "x-bias" lever which is on a little spring inside the printer just to the left of the carriage bay on the right side of the device. There are two photos of "broken" and "not broken" at this forum site:http://forums11.itrc.hp.com/service/forums/bizsupport/questionanswer.do?threadId=1085918
Since HP does not sell the little part to repair it, I phoned HP and got a good "trade-in, trade-up" price for a better device. Hope this helps someone else find the answer to the constant paper jam issue, as I always appreciate the FixYa forum help from everyone else here, too.